When you activate urzawa with heaven kick all critters hit by the skill deal backlash damage, even when they aren't in a 1 range radius.
I've made a post about this before (which was assumably ignored by the powers at be/shot down due to derp not seeing the same point-of-view).
I believe the consensus was that they backlash due to it being blunt/fist-aoe (which makes little-to-no sense).
I'll find the original thread after I'm home from work but for now: +1
This should be corrected.